Settings - ABB REG670 Applications Manual

Section 10
Voltage protection
10.4.3.2
422
ALARM: The output is activated when the alarm level has been reached and the alarm
timer has elapsed. When the system voltage is high this output sends an alarm to the
operator.

Settings

GlobalBaseSel: Selects the global base value group used by the function to define
IBase, UBase and SBase as applicable.
Operation: The operation of the Overexcitation protection OEXPVPH can be set to
On/Off.
MeasuredU: The phases involved in the measurement are set here. Normally the three
phase measurement measuring the positive sequence voltage should be used but when
only individual VT's are used a single phase-to-phase can be used.
MeasuredI: The phases involved in the measurement are set here. MeasuredI: must be
in accordance with MeasuredU.
V/Hz>: Operating level for the inverse characteristic, IEEE or tailor made. The
operation is based on the relation between rated voltage and rated frequency and set
as a percentage factor. Normal setting is around 108-110% depending of the capability
curve for the transformer/generator.
V/Hz>>: Operating level for the tMin definite time delay used at high overvoltages.
The operation is based on the relation between rated voltage and rated frequency and
set as a percentage factor. Normal setting is around 110-180% depending of the
capability curve of the transformer/generator. Setting should be above the knee-point
when the characteristic starts to be straight on the high side.
XLeak: The transformer leakage reactance on which the compensation of voltage
measurement with load current is based. The setting shall be the transformer leak
reactance in primary ohms. If no current compensation is used (mostly the case) the
setting is not used.
TrPulse: The length of the trip pulse. Normally the final trip pulse is decided by the
trip function block. A typical pulse length can be 50 ms.
CurveType: Selection of the curve type for the inverse delay. The IEEE curves or tailor
made curve can be selected depending of which one matches the capability curve best.
kForIEEE: The time constant for the inverse characteristic. Select the one giving the
best match to the transformer capability.
tCooling: The cooling time constant giving the reset time when voltages drops below
the set value. Shall be set above the cooling time constant of the transformer. The
default value is recommended to be used if the constant is not known.
tMin: The operating times at voltages higher than the set V/Hz>>. The setting shall
match capabilities on these high voltages. Typical setting can be 1-10 second.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
1MRK 502 071-UEN -
Application manual